Portable universal milling-machine.



G. E. MILLER da E. B. CANTRELL. PORTABLE UNIVERSAL MILLING MACHINE.APPLICATION FILED M1121, 1913.

1,107,22 1'. Patented Aug. 11, 1914.

3 SHEETS-SHEET l.

WITNESSES:

G. E. MILLER & E. B. GANTRELL. PORTABLE UNIVERSAL MILLING MACHINE.

APPLICATION FILED 1111.21. 1913.

1,107,221 Patented Aug. 11, 1914 3 SHEETS-SHEET 2.

11. E. MILLER & 11.131 GANTRBLL. PORTABLE UNIVERSAL MIL'LING MACHINE.APPLIGATION FILED JAN. 21, 1913.q

,107,221. Patented Aug.11,1914

3 SHEETS-SHEET 3.

of Oakland, county of or a horizontal UNITED STATES PATENT OFFICE.

GEOBG E. MILLER, OI' OAKLAND, AND DWIN B. CANTRELL, OF SAN FRANCISCO,

h l CALIFORNIA.

PORTABLE 'UNIVERSAL MILLIN G-MACHIN E.

Specification of Letters Patent. Application iled January 21, 1913.Serial No. 743,284.

Patented Aug. 11, 1914.

T0 all 'whom t may concern Be it'known that We, GEORGE E. VMILLERAlameda, State mi California, and EDWIN B. CAN'L'RELL, of the city andcounty of San Francisco, State of California, citizens of the UnitedStates, have invented new and useful Im rovements in Portable yUniversalMillingachines, of which the following is a specilication.

This invention relates to milling machines.

The object of the present'invention ins to provide a compact,electro-motor drlven milling machine in which the cutter shaft isadapted to be adjusted in a vertical plane,

plane, and ad'usted at diverse angles for the purpose o making variouscuts as may be required on a piece to be milled or otherwise machined. 1

An important object of the present invention is 'to provide in a millingmachine means connecting an electric motor Wit-h a milling or other toolshaft to be driven by the motor and' providing a ri id connectionbetween the motor support an the tool shaft support, whereby these twoelements will at all times, during various adjustments of the cutterwith relation to the work, move with rigid, inflexible relation to eachother, thereby avoiding the tendency to create undue friction in therunning arts by the disalinement of the motorsha t with the transmittinggear of the cutter shaft during these various adjustments.

The invention consists of the parts and the construction and combinationof parts as hereinafter more fully described and claimed, havingreference to the accompanying drawings, in which Y Figure 1 is a frontelevation of the milling machine showing thecutter mechanism inhorizontal plane. Fig. 2 is a side eleva tion showing the cutter shaftarran ed in vertical position. Fig. 3 is a plan View of Fig. 2. Fig. 4is a horizontal Section on line X-X, Fig. 2.'

In its present embodiment our invention consists of a suitable post,column or standard 2, 'having an appropriate base portion 3 adapted tobe bolte to the work to be machined or out, or, as in the present case,attached to a cross feed slide 4. The slide 4 is mounted on a pivotblock 5 which in turn is supported upon |a carriage 6 of a machine tool.

`17, for the rece tion Slidable upon the column 2 is a slide 7 ablevertical feed, consisting of a key 8 cngaged by a feed screw 9. 'lhefeed screw 9A extends upwardly through the post and has a crank orhandle 10 at the top which, when turned, raises or lowers the slide 7."he post 2 is slotted longitudinally through its diameter for aconsiderable length, as at 11, and extending through this slot is apivot bolt or shaft 12, one end of which is provided with a key 13engageable with I a bracket 14 supported on the adjacent end of theshaft 12. The bracket also has a hub portion 1 5 turnably lit-ting arigid bushing or journal 16, Fig. 4, projecting transversely andhorizontally from the slide 7; the outer end of the journal 16 beingthreaded, as at which is screwe up after the bracket 14 has beenassembled upon the extending end of the shaft 12. The collar or hub 15is freely turnable on its journal 16, and, since the bracket 14 is keyedto the pivotal shaft 12, these two elements will turn in unison.

Supported upon t-he bracket 14 is a suitable type of electric motor 19,from which projects a connector 20, one end of which is seated in asocket 21, Fig. 3, of the motor shaft and the other end of the connectoris seated in a socket 22 of a worm 23 forming a part of a transmittingmechanism, including a Worm gear 24 which is fast upon t-he adjacent endof a cutter or driven shaft 25.`

The transmitting gears 23-24 are suitably supported and housed in anoil-tight casing 26 which is rigidly, removably and adjustably securedto the adjacent face 27 of the slide 7 which is on the opposite side ofthe post 2 than the motor bracket 14. The housing is fastened to theface 27 by means of bolts 28, the heads of which may sweep in circulargrooves 29 in the face 27.

' For the purpose of rigidly connecting the motor 19 and thetransmission gear housing 26, we have provided the transverse axis orpivot shaft 12, on one end of which the motor-carrying bracket is keyed.Upon the of a collar or nut 18f other end the casing 26 is rigidlypinned, as

at 30, F ig; 4, so that for every angular adjustment of the casing 26,-With relation to the face plate 27 of the slide 7, the shaft 12 willturn evenly and carry the motor bracket 14 and the motor throughprecisely the same degree of angular movement, thus entirely eliminatingthe possibility of disalinement of the axis of the worm 23,' withrelation to 5 the axis of the motorshaft. i It is understood that thedriven shaft 25 of the machine can be provided with any `desirable typeof cutter or tool, as the work in hand may necessitate. In the presentinsta-nce we have shown milling cutters 31 of the ordinary type. S Fromthe fore oing it cwill be seen that by the present milling'machine weare enabled to employ a high speed electric motor, so connected to adriven shaft 25 that the speed of the latter can be much reduced overthe speed of' the motor..` By introducing a rigid connection between thereducing gearing and the motor we are enabled to make diverseadjustments of the position of the driven shaft, with relation to thework to be cut, by providing a rigid connection between the motor andthe gear train which will insure the positive and uniform adjustment ofthe motor and the gear train whenever the change vof position of thecutter shaft is desired.

By means of the slide 7 the tool can be moved in a vertical plane alongthe piece being machined, and by means of the cross feed slide 4 thecutting tools can be shifted horizontally along the work being machined,or, if desired,l the cutter can be moved through an are by means of the4pivotal block 5 turning about its central axis. In addition to theseseveral distinct feeds of the cutters or cutter we are enabled by ourpresent invention to' angularly adjust the cutter shaft 25, withrelation to the post 2, so that the cutters will operate at an angularposition upon the work; this angular adjust- 1 ment being provided bymeans of the pivot shaft 12 which extends through the post 2 in the slot11 and upon which shaft the gear casing 26 is rigidly secured. Theposition of the parts is rendered irm by the tightening up of the bolts28, after the shaft 25 has been adjusted to the desired angularposition.

Since the transmitting gear and cutter .shaft lare on one side of thepost 2 and the motor 19 and its bracket 14 are on the other side of thepost 2, the load of the movable parts of the post 2 is nicely balanced,so that the slide 7 can be readily adjusted vertically along the postwithout any bndin action, such as would occur if the loads o the partswere not approximately evenly balanced upon each side of the slide 7.This balancing of the ,load and the rigid connection of the motorbracket and motor with the transmitting gear case and the shaft 25insure-the uniform-angular movement of the motor and the gear case 26,when these parts 65 are turned with relation to the post 2 about theaxis ofthe pivotal connection or shaft 12 to which these elements arevrigid/ly though removably and adjustably connect Having thus describedour invention, what we claim and desire to secure by Letters Patentis- 1. A portable, universal milling machine comprising a post or columnhaving a longitudinally extending slot, a slide adjustable upon andalong said column, a motor supported upon one side of the slide, atransmitting gearing and its ease, a drive connectionf'between saidmotor and the transmitting gear supported on the slide, and amemberextending through the slot in the column and having rigidconnection with the motor and with said case, whereby these parts willmove in unison in an are about the axis of said member.

2. A portable, universal milling machine comprising a post or columnhaving a longitudinally and diametrieally extending slot, a slideadjustable upon and along said column, a motor supported upon one sideof the slide, a transmitting gearing and its case, a drive connectionbetween said motor and the transmitting gear supported on the slide, anda member extending through the slot in the column and having rigidconnection with the motor and with said ease, whereby these parts willmove in unison in an arc about the axisof said member.

3. A portable tool comprising a post or column having a longitudinalslot extending therethrough, a slide adjustable upon and along saidcolumn, a motor turnably supported on one side of the slide, atransmitting gear and a driven shaft supported on the opposite side ofthe slide, a driving connection between said motor and the transmittinggear, and a connection between said motor and the transmitting gearpassing through said slot, whereby the motor and said gear ivill moveuniformly in an are about the axis of said connection.

4. A portable, universally adjustable tool comprising a post or column,a slide adjustably {itt-ing said column, means for moving the slidealong and holding the same in adjusted position thereon, a motorturnably 115 llO supported vvon one side of the slide, a transmissiongearing `turnably supported upon the opposite side of the slide, saidpost having a longitudinal slot extending therethrough, a drivingconnection between the motor and the transmission gearing, and

a pivotal connection extending through are with relation to the slide.

5. In a portable milling machine the combination with an adjustablesupport, of a post or column removably att-achable to said support, aslide mounted on said post, a means for adj ust-ing and holding t-hesame in a given position thereon, said slide having a journal projectingtransversely from one side, a face plate with its plane parallel to theaxis of the post on the opposite side, said post having a longitudinalslot extending transversely therethrough, a shaft turnably supported inthe slide and extending through the slot in the ably adjustable upon theface plate and rigidly connected with the contiguous end of the shaft, atransmitting mechanism mounted upon said member, a bracket rigidlyconnected to the opposite end of the turnable shaft and having a portionturnably fitting upon the journal projecting from the contiguous end ofthe slide, a motor mounted upon said bracket, a driving connect-ionbetween said motor and the transmitting mechanism, said motor and saidmechanism moving uniformly and rigidly in an are about the axis of theturnable shaft, and a cutter shaft driven by said transmittingmechanism.

6. In a portable milling machine, a postor column, a slide mounted onsaid post, a means lfor adjusting and holding the same in a givenposition thereon, said slide having a journal projecting transverselyfrom one side, a face plate With its plane parallel to the axis of thepost on the opposite side, said post having a longitudinal slotextending transversely therethrough, a shaft turnably supported in theslide and extending through the slot in the post, a member turnablyadjustable upon the face plate and rigidly connected with the contiguousend of the shaft, a transmitting mechanism mounted upon said member, abracket rigidly connected to the opposite end of the turnable shaft andhaving a portion t-urnably fitting upon the journal projecting from thecontiguous end of the slide, a motor mounted upon said bracket, adriving connection between said motor and the transmitting mechanism,said motor and said mechanism moving uniformly and rigidly in an areabout the axis of the turnable shaft, and a cutter shaft driven by saidtransmitting mechamsm.

7. In combination with the carriage of a post, a member turn-- machinetool, a turnable support, a column adj ustably secured thereto, a slideadjustable along the column, said slide having a face plate with itssurface parallel to the axis of the column, a motor mounted upon theslide for movement therewith, a journal member turnably adjustable uponthe face plate of the slide, a cutter shaft in said journal, reductiongearing connecting the motor and said shaft, and means for moving theslide along the column and holding the same in predetermined positionthereon, the elements of the combination coperating to permit universalmovement of the cutter shaft.

8. A universal millingmachine comprising a slide post attachable to asuitable support, a slide fitting the post, a screw mechanism on thepost for moving the slide, said slide'having a face plate at one side,an angularly movable journal member bearing against said face, and meansfor fixing it thereon, a shaft mounted in said member and with its axissubstantially parallel with the plane of the axis of the/column, and amotor on the slide with connections for driving the shaft.

9. In a portable milling machine, a cutter shaft, means for holding ittilted angularly in one plane, said means including a journal with aclamp plate and a slide coperable therewith, means-for moving the slide,a support for the slide and said means, said support having means forattachment to a suitable motor on the slide, and connections extendingtransverse the support for imparting power from the motor to the shaft.

l0. A portable, universal milling machine comprising a tool shaft, acolumn, a motor for driving the shaft, and means for permitting linearand circular movements in a horizontal plane and angular and linearmovements in a vertical plane of the cutter shaft, said means comprisinghorizontally movable supports for the column, and a slide adjustable onthe column carrying the motor and shaftand having a relatively turnablepart.

In testimony whereof we have hereunto set our hands in the presence oftwo subscribing witnesses.

GEORGEl E. MILLER. EDWIN B. CANTRELL.

Witnesses:

W. W. HEALEY, Zon HARRISON.

